#6710 feat(desktop): pull requests split view — resizable list/detail with merge, close, and reopen

Summary

• Split-view layout for the pull-requests screen: a persistent, resizable list pane and a detail pane routed via <Outlet />, with collapse toggles for list-only or preview-only modes.
• List view matched to the Figma spec (flat All/Open/Merged tabs, richer row visuals) and a fixed Filters popover (repository/author/review filters, author sourced live from GitHub contributors).
• Lighter, consistent PR icon set (lucide/git-pull-request-arrow, stroke-width 1) across the app.
• Merge (squash/merge/rebase), close, and reopen actions on the PR detail page via a single actions dropdown, each gated by PR state and confirmed before mutating; icons match the PR icon language (git-pull-request-closed instead of a bare X).
• Detail header cleanup: removed a redundant near-empty toolbar row stacked above the header, tightened top padding, and aligned the header's bottom border with the list pane's toolbar border.

Test plan

• Verified live via CDP against the running dev app: list/detail resize and collapse toggles, author-contributor dropdown, Filters popover, merge/close/reopen dropdown and confirm dialogs (cancelled, never executed against a real PR)
• Confirmed header alignment and padding visually before/after each change
• bun typecheck / bun lint on touched packages

https://claude.ai/code/session_01299739VL1C3UdwH1mSkVY2

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Summary by cubic

Adds a split-view pull requests screen with a persistent, resizable list and a detail pane, plus in-app merge/close/reopen. Previously opening a PR unmounted the list (lost scroll/pagination) and actions weren’t available; now the list stays mounted and key PR state changes happen in-app with confirmation.

• Adds a resizable list pane (300–720px, double-click resets), persists width and collapse, and provides list-only and preview-only toggles that are mutually exclusive and always reachable; selecting a row expands a collapsed preview.

• List view matches spec: All/Open/Merged tabs over a single flat list; per-row icon, title, avatar/repo/#/branch, relative time (guarded), diff stats, and CI status; consolidated Filters popover (Repository/Author/Reviews) with visible values and an active-count badge.

• Author filter: for a single repo, a searchable contributors combobox with avatars; falls back to free-text for multi-repo. Backend adds workspaceCreation.getRepoContributors (prefers gh api, handles 204, falls back to Octokit, cached 5 minutes, skips bots).

• Detail header shows a state-tinted badge and a single actions dropdown. Supports merge (squash/merge-commit/rebase), close, and reopen with confirmation and non-destructive styling; success invalidates pull-request-detail and pullRequests, errors toast.

• Backend: pullRequests.setState (uses gh pr close/reopen) and pullRequests.mergePR (Octokit; resolves repo live). workspaceCreation.searchPullRequests accepts mergedOnly and enriches rows with additions/deletions/headRefName via the existing GraphQL checks batch. Direct #N lookups now respect mergedOnly and viewerRelationship; schema rejects combining viewerRelationship with author/review (viewerRelationship not used by this UI).

• State/routing: new persisted pullRequestsSplitViewStore; pullRequestsFilterStore adds mergedOnly, migrates persisted state (version 7), and serializes state=merged. The detail page removes its back button; the index route shows an empty preview with a list toggle. ResizablePanel now supports a disabled mode to avoid remounting on collapse.

• Review/rollout

  • Validate: list resizing/toggle persistence; Filters popover values and count; single-repo author combobox and fallback; per-row CI status and diff stats; PR actions (merge methods, close/reopen, confirmations) and query invalidation; URL state=merged; cross-repo row selection correctness.
  • Environment: host-service requires an authenticated gh CLI for contributors and close/reopen; Octokit is a fallback for contributors. No database changes or manual migrations.

Summary by CodeRabbit

• New Features

  • Added a split-view pull request experience with resizable list and detail panes.
  • Added open, all, and merged filters, contributor-based author filtering, and viewer relationship filters.
  • Added actions to close, reopen, and merge pull requests with confirmation prompts.
  • Added selectable pull request rows with repository, author, branch, status, and change statistics.
  • Added controls to show or hide the pull request list and detail preview.

• Bug Fixes

  • Preserved filters and selected details when navigating or changing searches.
  • Improved pull request layout styling across sidebar and top-bar states.